GoLocalBot. The project is closed - Platform for volunteers, NGOs, activists and crowdmapping.
HandUp Campaigns - Assemble your community to donate to those in need
GivingWay - Travel the world, do some good.
Ecosia - Ecosia is a green search engine that donates at least 80% of its profits from search ad revenue and...
Catchafire - Use your professional skills to help charities
Tab for a Cause - Raise money for charity with each new tab you open